SHIPWORMS OF THE PHILIPPINE ISLANDS BARTSCH 541 



which are here bent outward. The whole area is somewhat rough. 

 The posterior portion of the middle part is about as wide as the 

 anterior and median portions taken together, and is marked by 

 numerous incremental lines and the feeble continuations of the 

 stronger lines referred to for the middle part. The posterior part 

 forms a rather conspicuous auricle which is separated from the poste- 

 rior portion of the median part by a strongly impressed constriction. 

 The auricle is usually badly eroded and is marked by concentric lines 

 of growth paralleling the ventral margin. Interior bluish-white. The 

 anterior part joins the middle part in a raised tumidity. The middle 

 portion of the median part shows as a rough groove, at the ventral 

 termination of which the strong knob is present. The posterior part 

 extends over the posterior portion of the middle part as a strong 

 shelf; the inner edge of this part is very heavy and the cavity behind 

 it rather deep. The posterior portion when viewed from within is 

 spatulate, the part that extends up to the umbone being the handle. 

 There is a strong oblique irregular blade which springs from the 

 underside of the umbone and extends three-fourths of the way from 

 the umbone to the ventral knob. The pallet is very long and decid- 

 edly attenuated basally. There is a deep median fold on the outside 

 which divides it into the two parts. There is also a deep excava- 

 tion near the terminal lateral margin on the outside. Viewed from 

 the inside the attenuated lateral wings of the expanded portion 

 border the strong median rib which extends attenuatedly to the 

 edge of the distal portion. The two lateral flaps of the distal 

 expanded portion are decidedly concave. The calcareous margins, 

 when viewed from the inside, extend as two pointed horns at the distal 

 end, bearing the horny portion at their tips. There is a deep sinus 

 at the distal end both above and below. 



The type (Cat. No. 312919, U.S.N. M.) was collected by the United 

 States Bureau of Fisheries Steamer Albatross Philippine Expedition, 

 in a piece of wood dredged at station 5266 off Matocot Point, west- 

 ern Luzon, in 100 to 135 fathoms on mud bottom. It measures: 

 Height, 1.8 mm.; length, 1.5 mm.; diameter, 1.5mm. Pallet meas- 

 ures: Length, 7.3 mm., of which 2.2 go to the stalk; diameter, 0.9 mm. 

 Cat. No. 246128, U.S.N.M., contains a lot of specimens from the 

 same piece of wood. Cat. No. 312920 contains a lot of specimens 

 taken from a piece of wood dredged at station 5269 off Matocot 

 Point, western Luzon, in 200 fathoms on fine sandy and pebbly 

 bottom. 



I take pleasure in naming this shipworm for Dr. Hugh M. Smith, 

 formerly Commissioner of Fisheries and director of the Albatross 

 Philippine Expedition. 



